tính bằng cách thuận tiện
1919/2323x464646/747474x37/19
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![](https://rs.olm.vn/images/avt/0.png?1311)
à thì tớ có biết chút xíu ấy mà ngượng quá đi à đáp án là .............................................................................................................................. mình sẽ trả lời sau hi............hi............hi................hi
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{13}{19}\times\left(\frac{19}{13}-\frac{7}{9}\right)\\ =\frac{13}{19}\times\frac{19}{13}-\frac{13}{19}\times\frac{7}{9}\)
\(=1-\frac{91}{171}\)
\(=\frac{80}{171}\)
Thấy đúng thì k đúng giúp mik
![](https://rs.olm.vn/images/avt/0.png?1311)
`9/14+19/18+19/14+35/18`
`=(9/14+19/14)+(19/18+35/18)`
`=28/14+54/18`
`=2+3`
`=5`
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{3}{11}\text{×}\dfrac{7}{19}+\dfrac{3}{11}\text{×}\dfrac{10}{19}+\dfrac{3}{11}\text{×}\dfrac{1}{19}=\dfrac{3}{11}\text{×}\left(\dfrac{7}{19}+\dfrac{10}{19}+\dfrac{2}{19}\right)=\dfrac{3}{11}\text{×}1=\dfrac{3}{11}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{7}{19}\times\dfrac{1}{3}+\dfrac{7}{13}\times\dfrac{2}{3}\)
\(=\dfrac{7}{19}\times\left(\dfrac{1}{3}+\dfrac{2}{3}\right)\)
\(=\dfrac{7}{19}\times1\)
\(=\dfrac{7}{19}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{17}{25}\times\frac{13}{19}+\frac{17}{25}\times\frac{6}{19}\)
\(=\frac{17}{25}\times\left(\frac{13}{19}+\frac{6}{19}\right)\)
\(=\frac{17}{25}\times\frac{19}{19}\)
\(=\frac{17}{25}\times1\)
\(=\frac{17}{25}\)
_HT_
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
=19/23 x 23/37 x 37/19
=19/23 x 37/19/ x 23/37
=37/23 x 23/37
=1
1919/2323x464646/747474x37/19
= 19/23 x 23/37 x 37/19
= (19/23 x 37/19) x 23/37
= 37/23 x 23/37
= 1